Lock for screw threaded devices



Feb. 7, 1933.

R. C. ZEIDLER LOCK FOR SCREW THREADED DEVICES Filed Jan. 12, 1931 v .R mV mm n W. W w, F. .R 0 w.

ATTORNEYS.

Patented Feb. 7.193s

UNITED STATES VPATENT OFFICE annmonn our. zmnnnn, or narnorr, moment,assrorron re more Ismaerunme comm, or nnrnon, mcmoan, a GOBZPORATfON Imoment LOCK FOB SCREW THBEADFD DE VIGES Application and January 12,1931'. Serial m. 508,088.

ing purposes. The same is true of a nut. The distortingof the metal maybe accomplished by means of a suitable tool, and once such device islocked in position it is securely held and kept from becoming loose. Theinvention will be better understood by reference to the accompanyingdrawing, and the following detailed description.

Fig. 1 is a view of a device which in the present instance happensto bea pressure ring of a clutch designed to receive a stud constructed inaccordance with the invention.

Fig. 2 is a sectional view taken substantially on line 22 of Fig. 1.Fig. 3 is a side elevation of a stud. Fig. 4 is a view of the studmounted and distorted. V

Figs. 5 and 6 are views, respectively, of a nut and cap screw in whichthe inventiorf' may be embodied.

Fig. 7 illustrates a tool which may be employed with the stud fordistorting themetal to lock the same in place.

Figs. 8 and 9 are views illustrating a modified form of the invention. 5

A device or article designed to receive a screw threaded member is shownin Figs. 1

and 2 in the form of a plate or ring 1 pro-' vided with a stud-receivingboss 2 with an internally threaded hole 3. The face of the boss 2against which the head of a screw threaded member may seat, is providedwith a groove 4.

' vA stud designed to cooperate with such a receiving member, is shownin Fig. 3, having 'a screw threaded end 10, a shoulder or flange 11, andan exposed end 12 designed for attachment to any'other device, and forany purpose; The head 11 may be square or hexagonal for receiving a toolor wrench for screwing the stud into the aperture 3, and the flange orhead 11 is d v 'gned to seat upon the boss 2, as shown in Fig. 4. Theflange 11 is of a thickness which will vpermit of 1t being fairlyreadily distorted,

yet the thickness is such as to provide for the necessary strength. Asshown in Fig. 4 the co flange is distorted so that partof it is bentinto the recess 4, as illustrated. This may be accomplished by asuitable tool as shown in Fig. 7 having a shank 13 hollowed as at 14for. fitting over the end 12 of the stud and 66 provided with ribs 15designed to seat upon the flange 11. This tool may be fitted over thestud as described and force applied thereto by means of a hammer orautomatic niachinery to distort the flange 11 and to throw to parts ofits metal into the groove 4. This securely locks the stud in place toprevent it from loosening. This forms a very effective lock to theeliminationvof. other and separate .locking elements such as lockwashers or the like, and in fact permits removing the stud only byshearing part of the metal.

e invention as shown in F' 5 is incor-. porated in a nut. The body oft enut illus- .trated at 20 is designed to receive a suitable turning toolor the like, and integral with the body is a distortable flange 21. Thenut is, shown applied to abolt or the like 22. A

cap screw is shown in Fig. 6. The tool-receiving head isillustrated at23with the dis- 86 torted portion of the head or flange at 24.

A modified form contemplates employing a rib 30 on a receiving member 1in place of the groove 4, in which case the distortable flange or head,as for example flange 11' of 90 the cap screw, may be distorted or downaround the rib as illustrated in Fig. 9. However, the form shown inFigs-'1 to is thought to-be preferred because that provlde's a flat seatfor the head, and further, the walls of the groove need not necessarilybe accurately machined but left in the rough. Accordingly, the face ofthe seat on the plate for receiving the head may be finished as desired,and the presence of the groove ofiers 10o 2 aeeasaa no difiiculty orrequires no additional attention or operations.

I claim: A stud for association with a su porting 5 memberhaving aninternally threadhdaperture and a seat around the aperture, and whereinthe seat has a portion lying out of the normal plane of the seat, saidstud having a body externally threaded at opposite l0 ends, and arelatively thin flange intermediate the ends of the stud and disposedbetween said screw threaded portions, said flange being shaped for thereception of a tool or the like whereby one end of the stud may be 15screwed in said aperture with the flange abutting the seat, said flangehaving suificient strength for tigihtly screwing the stud into theagertnre w en turned by the tool, and said ange being distortablewhereby por- 20 tions of it may be distorted into cooperative relationwith the said portion of the seat which lies out of the normal plane ofthe seat to lock the stud in lace.

In testimxilfiyfivhereo I afiix m signature.

OLD CARL IDLEB.

